/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraSystemViewModel.h
Changes the version of an existing emitter in the system
bool ChangeEmitterVersion ( const [FVersionedNiagaraEmitter](API\Plugins\Niagara\FVersionedNiagaraEmitter) & Emitter, const [FGuid](API\Runtime\Core\Misc\FGuid) & NewVersion )